CVE-2026-64298: In the Linux kernel, the following vulnerability has been resolved: NFSv4: include MAY_WRITE in open permission mask fo

A security vulnerability in the Linux kernel's NFSv4 (a network file system protocol) was found where the permission check for opening files with truncation (O_TRUNC, which deletes file contents) did not properly require write permission. This allowed users to truncate files they couldn't normally write to, violating POSIX standards (the portable operating system interface standard). The fix ensures that write permission is checked whenever O_TRUNC is used, matching what a standard server would enforce.